Method for manufacturing blisk, and blisk intermediate product

Abstract

A method for manufacturing a blisk includes an intermediate product molding step of molding a blisk intermediate product including a circular disk-corresponding part, a plurality of rotor blade-corresponding parts, and bridges each connecting a front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and a rear edge of the other one of the rotor blade-corresponding parts. The method for manufacturing the blisk further includes a disk finishing step of cutting the disk-corresponding part so as to finish the disk-corresponding part into the disk in a product form, and a rotor blade finishing step of cutting each bridge so as to finish the respective rotor blade-corresponding parts into the respective rotor blades in a product form.

What is claimed is: 
     
       1. A method for manufacturing a blisk including a circular disk and a plurality of rotor blades arranged at intervals in a circumferential direction along an outer peripheral surface of the disk, the method comprising:
 an intermediate product molding step of molding a blisk intermediate product including a circular disk-corresponding part having a cutting margin in addition to the disk, a plurality of rotor blade-corresponding parts arranged at intervals in a circumferential direction along an outer peripheral surface of the disk-corresponding part and each having a cutting margin in addition to the respective rotor blades, and bridges each connecting a front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and a rear edge of another one of the rotor blade-corresponding parts; 
 a disk finishing step of cutting the disk-corresponding part so as to finish the disk-corresponding part into a form of the disk; and 
 a rotor blade finishing step of sequentially cutting the respective rotor blade-corresponding parts in a direction from a tip end to a base side of the respective rotor blade-corresponding parts while each bridge is removed so as to finish the respective rotor blade-corresponding parts into a form of the respective rotor blades, 
 wherein the blisk intermediate product is molded such that a metal block is subjected to forging processing in the intermediate product molding step. 
 
     
     
       2. The method for manufacturing the blisk according to  claim 1 , wherein each bridge connects the front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and the rear edge of the other one of the rotor blade-corresponding parts entirely in a direction from the base side to the tip end of the respective rotor blade-corresponding parts. 
     
     
       3. The method for manufacturing the blisk according to  claim 1 , wherein the sequentially cutting of the respective rotor blade-corresponding parts in the direction from the tip end to the base side of the respective rotor blade-corresponding parts includes rough milling, interim finish milling, and finish milling.